Replace VideoStream::SizeCallback with VideoStream::Observer interface.

remoting/protocol/video_frame_pump.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_PROTOCOL_VIDEO_FRAME_PUMP_H_
 #define REMOTING_PROTOCOL_VIDEO_FRAME_PUMP_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 69 matching lines @@
                  std::unique_ptr<webrtc::DesktopCapturer> capturer,
                  std::unique_ptr<VideoEncoder> encoder,
                  protocol::VideoStub* video_stub);
   ~VideoFramePump() override;
 
   // VideoStream interface.
   void Pause(bool pause) override;
   void OnInputEventReceived(int64_t event_timestamp) override;
   void SetLosslessEncode(bool want_lossless) override;
   void SetLosslessColor(bool want_lossless) override;
-  void SetSizeCallback(const SizeCallback& size_callback) override;
+  void SetObserver(Observer* observer) override;
 
   protocol::VideoFeedbackStub* video_feedback_stub() {
     return &capture_scheduler_;
   }
 
  private:
   struct FrameTimestamps {
     FrameTimestamps();
     ~FrameTimestamps();
 
@@ skipping 57 matching lines @@
 
   // Capturer used to capture the screen.
   std::unique_ptr<webrtc::DesktopCapturer> capturer_;
 
   // Used to encode captured frames. Always accessed on the encode thread.
   std::unique_ptr<VideoEncoder> encoder_;
 
   // Interface through which video frames are passed to the client.
   protocol::VideoStub* video_stub_;
 
-  SizeCallback size_callback_;
+  Observer* observer_ = nullptr;
   webrtc::DesktopSize frame_size_;
   webrtc::DesktopVector frame_dpi_;
 
   // Timer used to ensure that we send empty keep-alive frames to the client
   // even when the video stream is paused or encoder is busy.
   base::Timer keep_alive_timer_;
 
   // CaptureScheduler calls CaptureNextFrame() whenever a new frame needs to be
   // captured.
   CaptureScheduler capture_scheduler_;
@@ skipping 12 matching lines @@
 
   base::WeakPtrFactory<VideoFramePump> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFramePump);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_VIDEO_FRAME_PUMP_H_